Technology Prefixes Applied
Another method, called technology
prefixes, allows you to include special characters in the called number.
These special characters (most commonly designated as 1#, 2#, 3#, and so on) are
prepended to the called number on the outgoing VoIP dial peer. The gatekeeper
then checks its gateway technology prefix table for gateways that are registered
with that particular technology prefix. Technology prefixes also identify a
type, class, or pool of gateways.
Voice gateways typically register with technology prefix 1#,
H.320 gateways with technology prefix 2#, and voice mail gateways with
technology prefix 3#. Multiple gateways can register with the same type prefix.
When this happens, the gatekeeper makes a random selection among gateways of the
same type.
If the callers know the type of device that they are trying to
reach, they can include the technology prefix in the destination address to
indicate the type of gateway to use to get to the destination. For example, if a
caller knows that address 7275550111 belongs to a regular telephone, the caller
can use the destination address of 1#7275550111, where 1# indicates that the
address should be resolved by a voice gateway. When the voice gateway receives
the call for 1#7275550111, it strips off the technology prefix and routes the
next leg of the call to the telephone at 7275550111.
You can enter technology prefix commands on gateways and
gatekeepers in two places, depending on how you want to design the technology
prefix decision intelligence:
You can implement this type of digit manipulation and
management of dialed numbers in various ways, depending on the infrastructure of
the network. All of the components, including the gatekeepers, gateways, Cisco
CallManagers, PBXs, key systems, and other systems, might need to be included in
the process.
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